Funniest tweets of the final presidential debate

The final presidential debate elicited 6.5 million tweets in 90 minutes

The breakout topic of the night was a line about "horses and bayonettes"

Other trending topics included everyone loving teachers and if Obama went on an "apology tour"

(CNN) -- Monday night's third and final presidential debate was a bittersweet occasion for the Twittersphere. The previous two presidential debates, and one equally entertaining vice presidential debate, have provided rich material for the wits of Twitter. Their rapid-fire commentary turned what could have been dry television into deeply entertaining multi-screen experiences. As many pointed out on Twitter, the micro-blogging service is like Mystery Science Theater for live television.

This debate, which took place at Lynn University in Boca Raton, Florida, is the last for the current election cycle, which will end when voters go to the polls on November 6.

The meme of the evening did not stem out of one candidate's gaffe, but from a well-executed zinger (the words "gaffe" and "zinger" will officially be retired on November 7). Responding to a criticism from Romney about the size of the U.S. Navy, Obama said: "You mentioned the Navy, for example, and that we have fewer ships than we did in 1916. Well, Governor, we also have fewer horses and bayonets, because the nature of our military's changed. We have these things called aircraft carriers where planes land on them."

The hashtag #horsesandbayonettes and parody account @Horsesbayonette quickly followed. Other popular moments included moderator Bob Schieffer slipping up and saying "Obama bin Laden," the repeated use of the word "tumult" and whether or not the U.S. should "divorce" Pakistan.

Obama, Romney spar over troops in Iraq

Obama, Romney battle over foreign policy

Reality Check: Nuclear Iran

President Barack Obama and Republican presidential candidate Mitt Romney depart the stage after the debate at Lynn University in Boca Raton, Florida, on Monday, October 22. The third and final presidential debate focused on foreign policy. See the best photos from the second presidential debate.

Romney and Obama greet each other at the end of the debate Monday night.

Obama and Romney hug their wives on stage after the debate.

President Obama greets first lady Michelle Obama.

Romney gestures beside his wife, Ann, on Monday.

Romney and Obama participate in the debate moderated by Bob Schieffer of CBS News.

Obama makes a point on Monday. He criticized his opponent on a host of foreign policy issues -- claiming Romney had favored positions that would have hurt the United States.

Romney gestures during the debate. The Republican nominee said Obama's foreign affairs policies have made the United States less respected and more vulnerable.

Obama listens during the final presidential debate.

Obama reacts to statements by Romney on Monday.

Romney emphasizes a point during the debate.

Obama and Romney face off while Schieffer looks on.

Obama answers a question Monday.

Romney speaks during the debate.

Monday's debate promised to be among the most-watched 90 minutes of the entire 2012 presidential campaign.

Schieffer listens to the candidates' responses during the debate.

Obama looks to Schieffer while debating Romney.

Romney and Obama debate on stage. The final face-to-face showdown took place 15 days before the election.

Romney listens as Schieffer speaks during Monday night's debate.

Obama makes a point during the debate.

Obama listens as Romney responds to a question Monday.

Obama and Romney greet each other as they join Schieffer on stage.

Ann Romney, center, and other members of the Romney family take their seats.

Schieffer appears on stage prior to the debate Monday. He is CBS News' chief Washington correspondent and has been the host of the Sunday morning discussion show "Face the Nation" since 1991.

Co-chairmen Frank Fahrenkopf, left, and Mike McCurry of the Commission on Presidential Debates address the audience at Lynn University.

First lady Michelle Obama arrives for the debate.

Romney and his wife, Ann, sit backstage with their family before the start of Monday's debate with President Obama. It was the candidates' final showdown before Election Day on November 6. See the best photos from the second presidential debate.

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Photos: The final presidential debate

The volume of tweets was a bit lower this round, with 6.5 million tweets sent during the hour and a half event, according to Twitter. The previous debate had 7.2 million tweets, the first 10 million (a record for a U.S. political event).

Patrick W. Gavin -- I'm really going to miss you guys's live-tweeting of debates for the next four years.

Jeffrey Goldberg -- No event in the history of Boca Raton has started later than this debate.